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Subject: Re: Some positions (in last position Crafty19.10 likes Qxh2)

Author: Frank E. Oldham

Date: 20:00:24 05/07/04

Go up one level in this thread


On May 07, 2004 at 21:54:04, Robert Hyatt wrote:

>Crafty likes Kd6, but given enough time might go for Qh2.  That has risen to
>position 2 in the root move list...
>
>
>               17->   4:57  -1.44   1. ... Kd6 2. Qg2 Rg7 3. f4 Qxf4 4.
>                                    Qxg7 Qxe4+ 5. Kg1 Qxd3 6. Qf6+ Kd5
>                                    7. Qd8+ Ke4 8. Qh4+ Ke5 9. Qxh5+ Qf5
>                                    10. Qxf5+ Kxf5 11. Kf2 Ke4 12. Ke1
>                                    d3 13. Kd2 (s=2)
>.
>
>
>> This reads like a pawn endgame. Any adventurous engines go for Qxh2+ followed
>>by b5? Expect some swings in eval. The methodical Kd6 should be a win.
>>
>>MvH Dan Andersson

crafty19.10f changes to Qxh2 in ply 16 (2:03)
letting it run a bit -- two fail-highs keep improving the score slowly

               15->  44.19  -1.72   1. ... Kd6 2. Rd2 Qxh2+ 3. Rxh2 Ke5
                                    4. Kg1 Kf4 5. Kf2 c4 6. bxc4 Rc7 7.
                                    Ke2 Rxc4 8. Kd3 Rxa4 9. Rb2 Ra3+ 10.
                                    Kxd4 Rxf3 11. Rxb6 Rxh3 (s=2)
               16     1:12  -1.42   1. ... Kd6 2. Qg2 Rg7 3. f4 Qxf4 4.
                                    Qxg7 Qxe4+ 5. Kg1 Qxd3 6. Qf6+ Kd5
                                    7. Qd8+ Ke4 8. Qh4+ Ke5 9. Qe7+ Kf4
                                    10. Qh4+ Kf5 11. Qxh5+ Kf4 12. Qh4+
                                    Ke3 13. Qg3+ Kd2 14. Qxd3+ Kxd3
               16     2:03  -1.51   1. ... Qxh2+ 2. Kxh2 Kd6 3. Kg3 Ke5
                                    4. Kh4 Kf4 5. Kxh5 Rd6 6. h4 Re6 7.
                                    Rd1 Kxf3 8. Kg5 Rxe4 9. Rf1+ Ke2 10.
                                    Rf4 Re3
               16->   2:03  -1.51   1. ... Qxh2+ 2. Kxh2 Kd6 3. Kg3 Ke5
                                    4. Kh4 Kf4 5. Kxh5 Rd6 6. h4 Re6 7.
                                    Rd1 Kxf3 8. Kg5 Rxe4 9. Rf1+ Ke2 10.
                                    Rf4 Re3 (s=2)
               17     3:41  -1.43   1. ... Qxh2+ 2. Kxh2 Kd6 3. Kg3 Ke5
                                    4. Kh4 Kf4 5. Kxh5 Rd6 6. h4 Re6 7.
                                    Rd1 Kxf3 8. Kg5 Rxe4 9. h5 Re3 10.
                                    Rf1+ Ke2 11. Rb1
               17->   4:03  -1.43   1. ... Qxh2+ 2. Kxh2 Kd6 3. Kg3 Ke5
                                    4. Kh4 Kf4 5. Kxh5 Rd6 6. h4 Re6 7.
                                    Rd1 Kxf3 8. Kg5 Rxe4 9. h5 Re3 10.
                                    Rf1+ Ke2 11. Rb1
               18     5:04     ++   1. ... Qxh2+!!
               18->   8:53  -1.82   1. ... Qxh2+ 2. Kxh2 Kd6 3. Kg3 Ke5
                                    4. Kh4 Kf4 5. Kxh5 Rd6 6. h4 Re6 7.
                                    Rd1 Kxf3 8. Kg5 Rxe4 9. h5 Re3 10.
                                    Rf1+ Ke2 11. Rb1
               19    39:21  -2.17   1. ... Qxh2+ 2. Kxh2 b5 3. axb5 a4
                                    4. e5 axb3 5. Rxb3 Kb6 6. e6 Re7 7.
                                    Kg3 Rxe6 8. f4 c4 9. f5 h4+ 10. Kf3
                                    Rf6 11. Rb4 Kc5 12. Rb2 Rxf5+ 13. Ke4
               19->  39:28  -2.17   1. ... Qxh2+ 2. Kxh2 b5 3. axb5 a4
                                    4. e5 axb3 5. Rxb3 Kb6 6. e6 Re7 7.
                                    Kg3 Rxe6 8. f4 c4 9. f5 h4+ 10. Kf3
                                    Rf6 11. Rb4 Kc5 12. Rb2 Rxf5+ 13. Ke4
               20    48:54     ++   1. ... Qxh2+!!
               20    79:41  -2.67   1. ... Qxh2+ 2. Kxh2 b5 3. axb5 a4
                                    4. bxa4 c4 5. Rd1 d3 6. e5 c3 7. e6
                                    Rd6 8. a5 c2 9. b6+ Kd8 10. Rg1 d2
                                    11. b7 Kc7 12. Rg7+ Kb8 13. e7 Re6
                                    14. e8=B Rxe8
               20->  80:02  -2.67   1. ... Qxh2+ 2. Kxh2 b5 3. axb5 a4
                                    4. bxa4 c4 5. Rd1 d3 6. e5 c3 7. e6
                                    Rd6 8. a5 c2 9. b6+ Kd8 10. Rg1 d2
                                    11. b7 Kc7 12. Rg7+ Kb8 13. e7 Re6
                                    14. e8=B Rxe8
?               21    83:15   1/20*  1. ... Qxh2+
Black(0): ?
              time=83:15  cpu=393%  mat=0  n=12976801678  fh=87%  nps=2.60M
              ext-> chk=607580122 cap=16328307 pp=128217962 1rep=13224376
mate=538344
              predicted=0  nodes=12976801678  evals=3853002158
              endgame tablebase-> probes=0  hits=0
              SMP->  split=8050  stop=1220  data=10/32  cpu=327:44  elap=83:15

Frank



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